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Hi yomgyo...
Try deleting the recordings this way...--------------------------------------------------------------------------------------------------------------------------------BIG WARNING: DO NOT DELETE THE FILES NEEDED TO OPERATE YOUR MP3 PLAYER.Hook up your mp3 player to your computerGo to your desktop and double left click on "My Computer"When it opens you will see listing that says "Devices with Removal Storage" your mp3 player should be listed there.Right click on your mp3 player, and a window will open, right click on "Open" and now your files/songs should be visible.Hold the left click down and drag it across all the files/songs that you do not want this will highlight the files/songs you do not want, release,right click and then click on "Delete"Now you mp3 player should be clear of the files/songs you do not want.ONE MORE BIG WARNING: BE CAREFUL AND DO NOT DELETE THE FILES NEEDED TO OPERATE YOUR MP3 PLAYER.Please take time to rate me thumbs up

Deleting Files,Pictures,Videos,Audio Books, Recordings,etc. from MP3 Player-----------------------------------------------------------------------
Hook up your mp3 player to your computerGo to your desktop and double left click on "My Computer"When it opens you will see listing that says "Devices with Removal Storage" your mp3 player should be listed there.Right click on your mp3 player, and a window will open, right click on"Open" and now your files/songs should be visible.Hold the left click down and drag it across all the files/songs that you do not want this will highlight the files/songs you do not want, release, right click and then click on "Delete"Now your mp3 player should be clear of the files/songs you do not want.Be careful and do not delete files needed to operate your MP3 player.
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Hook up your mp3 player to your computer
Go to your desktop and double left click on "My Computer"
When it opens you will see listing that says "Devices with Removal Storage" your mp3 player should be listed there.
Right click on your mp3 player, and a window will open, right click on "Open" and now your files/songs should be visible.
Hold the left click down and drag it across all the files/songs that you do not want this will highlight the files/songs you do not want, release, right click and then click on "Delete"
Now you mp3 player should be clear of the files/songs you do not want.
Be careful and do not delete the files needed to operate your MP3 player
Good Luck,
I hope this helps
Please rate me,
Thank You

all you have to do is go to all songs list....then you have to select a recording (most likely titled MEC(then some numbers) next hold the back arrow down for about three seconds and a little grey list should pop up....select delete song/recording. that's all you have to do.

If you can connect it to a PC with XP on it, and have an iRiver Music Manager; once your device is recognized, you will be able to manually manage files on your iRiver, including deleting any voice recordings on it.